The real benefit of using a bladder over an IFP is when the shock is working dynamically or in “riding situations”. This same situation happens in suspension causing a loss of damping. Picture turning on a hose, what happens as the water is pushing the air out of the line? Water intermittently shoots out in between gaps of air. Cavitation is when there is a gap in the oil caused from air bubbles and creates a temporary loss of damping. This decreases the chances of what’s called cavitation. When the shock goes to extend again, the bladder pushes the oil back in the opposite direction. The next inch of spring compression will take another 300lbs and so on until the spring becomes solid. For example, if we have a 300lb spring that is 12 inches long, it takes 300lbs to compress the spring 1 inch. Linear spring curves take a very consistent amount of force to compress a shock throughout the entire stroke. This type of spring curve gives the rider great small bump compliancy and excellent bottom out resistance. Progressive spring rates take very little force to initiate suspension movement then a high amount of force to fully compress or bottom out. That means it takes more force to compress the spring at the end of the travel than at the beginning. Progressive spring curves take a variable amount of force to compress a shock throughout the entire stroke. The amount of force it takes to continue to compress the spring determines if it is a linear or progressive spring curve. Spring curves refer to the amount of force it takes to compress the spring at a given point in the travel. Knowing and understanding the difference can drastically improve your feel of suspension and aid in tuning to fit your personal riding style. These two terms are thrown around in mtb suspension lingo often but many people don’t truly understand the difference. WHAT’S THE DIFFERENCE BETWEEN PROGRESSIVE AND LINEAR?
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